I use my IPad most of the times to get to TQS and pretty much anything else for that matter.
To get a screenshot, simultaneously press and release both, the menu button (the main button below the screen)and the power/lock button (the switch on the top edge of the device). The screen will go blank for a second and you'll hear a camera shutter noise.
The screen shots you take are automatically saved in the default Photos app under an album called "Saved Photos" or "Camera Roll" depending on your device. From there you can e-mail, post, edit. Etc.
This doesn't work on the 1st gen iPad, since that one doesn't have a camera but, works on all other versions and iPhone also.